Carbureter.



WnLLInGfroN-W. Munt, or BALTIMORE, MARYLAND. Y

cARBunnr'En. l

To aZZ whom 'it may concern: j A

Beit' known that I, VELLINGTON Muni, a vcitizen of the United States ofAmerica, residing at Icity of Baltimore, State of Maryland, haveinvented cer/tain neW and useful improvements in Carbureters, of whichthe followingis a specification.

This invention relates to a vcarbureter'of the 'constant level type foruse with. internal combustion engines.

' The object ofthe invention is to provide in a device of this nature,simple and im, Vp proved means for automatically regulating the flow ofair and fuel in the proper proportions under theinfiuence of thevarymgsuction of the engine.

For the purpose of regulating the flow of air and fuel, a'conical airiioat vis provided;

' This is placed in the air passage of the carbureter and is soarranged' that its vertical position is determined by the Vacuum of theengine, the area of the air passage being v correspondingly varied andlikewise' determined by the vacuum. Theloat is also provided with meansfor delivering the vfuel on its conical surface, Athe vdeliveryapertures being fed froma central chamber which re- 4ceives the fuelnozzle, and the nozzle-in turn acts as a guide for the float as Well asa means for delivering the fuel inA the chamber. v 1 In the preferredform of the invention,4 for the purpose of steadying the movements -ofthe air lioat as it rises and falls, the-,fuel

tube is provided with a helical guide surface which coperates'witha'corresponding internal helical guiding surface inthe ioat imparting arotary' motion vthereto and theA fuel passages radiate from the chamberto various points on the surface of the iloat so that as the. floatrotates and rises and4 fallsI the dominating outlet is in the main' aircurrent.

ln order that vthe supply o'f fuel atlow throttle when the 'oat is downand the-air friction high, need not be excessive, the main nozzle andfloat apertures are of reduced size as compared to the area of theopening necessary `to deliver fuel to the engine at full speed, and'asupplementary nozzle is provided which, though suction-controlled, islocated in a separatechamber communieating with the air passage, but soarranged that it only operatesv when an excessive volspeeication fLetters Patent. Patented my4 20,\ 1915 v Application lcd September 22,1914. Serial N o. 862,910.

ume of airis being drawn through the\car' bureter, thus supplying thedeficiency of iiuel'A plate.` Fig. 4 shows the throttle valve M slliaft;and Fig.. shows the oat in bottom an. 1 Theform of carbureter in4connection With which my invention has been illustrated, isA

similar in many points to one which is the' subjectof my. endingapplication, 'Serial No. 836,063 filet May 4th, 1914. The' body. portionof the carbureter-consists of a *bot-4 tom section anda top-section,.secured t0- gether by yany suitable means. These two sections insteadof having mterengagmg portions as 1sI usually 'the' case, have thecontacting surfacesl ot' the bottoml and top respectively, finished-flat and plane so that the Work can be' done at the minimum of cost.projects through the plane of Contact and the fiat' surface may befinished by grinding.

The drawing shows a float chamber 1 a carbureting chamber 2, an intakepassage l and a delivery 6. In the intake passage l1,

there isla choker valve 5, and in the delivery passage 6, Aa throttlevalve 7. The carburet-- l ing or mixing chamber 2 and the intake passage4 are connected by an opening 8, 1n which 1s a frustowomcalor conoidalfloat 9.

In the preferred formneither section In the form .of the inventionshown, thev float chamber 'l has an extension 11 beneath the carburetingchamber andthere isan upv right main nozzle .12 seatedin the top-wall 13of this chamber. rlhe float' 9 is provided with a centra'l aperturesland the nozzle extends intov and Well toward the top ofthe chamber/10 inthe float 9. In fact when there is no' 'draftor vacuum as when theengine is not running or is idling at slow speed, the float rests on thenozzle, the end of the Vnozzle engaging the top'of the chamber in thefloat. At this time the float valve does not touch the periphery? of theopening which, though never engaged by the float valve, might be termedaseat. This pre-v vents sticking of the valve at starting orat othertimes when it should open on accelera l discontinued or reduced. thefeeding of gasolene, when the float is rest- At one side of thecarbureting chamber 2, there is any extension or supplementary chamber1i preferably having ay top wall 15 and open at the side into the mainair passage. ln this chamber is a siumlementary nozzle 17V also inupright position and eX- tending downward through the top wall of theextension 11. rl'he chamber 14 is a dead air chamber, out of the aircurrent under normal slow running conditions.

kIn the preferred form of the as shown, the main nozzle '12 has ahelical rib 18 on its surface, and the chamber 10 is provided with a.corresponding helical groove 1.9. ltadiating from the chamber 1()v are`fuel passages as 21, 22, 23 and 24, "the first extending'from the upperpart of .the chamber 10 to the conical surface of the float 9 near itsupper edge, the second and third from points slightly lower on `thechamber 10 to correspondinglylower points on the conical surface of thefloat, the fourth from a point well down in the chamber to acorresponding point on the surface of the float. Any preferred number ofopenings or passages may be used. For the purpose of regulating, theflow through rthe nozzle 12, a needle valve 25 is provided.

In operation, at low speeds,the suction in the carbureting or mixingchamber 2 lifts the air float 9 slightly from its seat, opening arestricted air passage between the surface of the float and its seatthrough which the air rushes spraying the fuel from thetop passage 21into the mixing chamber 2, giving the desired and mined mixture at lowspeed. At higher speeds, the float is lifted farther from its seatincreasing the area of the air passage, also lengthening the fuelpassage from the nozzle 12 to the passage The passage 21 is also movedto a less restricted section of the air passage so that its delivery endis subject to less air friction. ln this way, the

vdischarge from the passage 21,is decreased,

but at thesame time the nent lower passage 22 .is moved into operativeposition in'the restricted portion of the opening 8 so that theproportion of the fuel to the flow of air is4 maintained. In thisconnection 'it is important to notice that if the passage'22 were madesmall enough to supply the eX- act amount of fuel to be added to thedischarge of fuel from the spray passage 21 `to keep the mixtureconstant, there would be `great risk of complete stoppage of thispassage by even the smallest grain of dirt so `in orderto avoid thisrisk, and make 41t possible to use drills of standard sizes for making"these passages, advantage has beenlv ing on the nozzle, the end of thenozzle preferably notched at 20.

invention' predcterl taken of the rotary motion of the float, thepassages being so located points 'determined experimentally that theymove into or 4out of the full current of air flowing in an obliquedirection through the carbureter, thus increasing ordecreasing the'spraying effect of the air at the respective passages so thepredominating nozzle is always in the' main air current. At the higherspeeds, the passage comes into operation but at the highest speeds,these three orifices 21, 22 and 23 are not of a capacity tosupplysufficient fuel for the requirements of the engine, and at this point,the fuel nozzlell, being so placed that it is not atlected by the normalflow of air, comes into operation when the flow is more than sufficientto give an operative mixture with the fuel supply from the passagesn 2l,"2 2a and 24'. lt is only under these cond ions that the suction in thevicinity of this nozzle is suflicient to cause it to feed and the heightof the nozzle may be varied to vary its scope of operation. The functionof this nozzle which is about on a level with the liquid as it is placedwill loe easily understood from the fact that if the fuel. spraypassages 21, 22, 23 and 2l are made large enoughto supply fuel demandsof the engine at full capacity of the air passage, the yflow of fueltherefrom when operating in restricted areas under the influence of acurrent of air flowing at a high velocity, would unduly enrich the mix-Y ture, and for this reason, it is necessary to supply add1t1onal fuelwhen the flexible air passage has reached its greatest capacity.

In the form of the invention shown, the bottom section includes thefloat chamber, the air intake, and the carbureting passages, carr ingthe primary or main fuel nozzle 12 and secondary or supplementary fuelnozzle 17. The top section includes theV gasolene supply passage 33 andthe outlet or mixture passage (3 together with the carbureting or mixingchamber `The passage 33 is formed on or with a disk-like portion 35,which forms the cover to the float chamber and the mouth of the passageis chambered at 36 to receive a valve seat 3?,"Which is pressed orotherwise forced into the cha-xnber and the float guide 3S, in the formof a cuppedtube, the cupped or enlarged portion 39 being formed at the`top and opened upward. This cup is forced into the 'chamber 3G,following the. valve seat 37, serving i to hold the latter in place.lThe cup 39, is perforated at 40 to form outlets for the gasolene intothe float chamber and the tube proper receives and engages an uprightpin valve l ll1 on the "float 49, the latter being annular in the` formof the invention shown, it is rac comes available in turn to deliver itsmaximum discharge as the float moves up and douai. i

lO. In a carbureter a constant level 'fuel supply chamber, an airopening, an ,air float controlling said passage and having a guidechamber therein, thel'uel nozzle extending into the chamber, means 'onthe nozzle and coperating means on the -Walls of the guide chamber forgiving the float a rotary movement as it rises and falls, a dead airchamber communieating with the air passage and a suction-controlled fuelnozzle in the chamber the second main luel nozzle bcingon the intakeside ol the float and outside the constricted area around the float sothat the nozzle is operative only under full throttle conditions.

ll. lin/a carbureter, a Constant level supply chamber, am air opening, aconical air lieat controllingsaid opening and'having a lverticallyextending chamber therein, a fuel imizzleextending into the chamber;means on the n'ozzle and cooperating means on the a'allsf ot the guideychamber for giving the iioata rotary movement as it rises and falls,fuel outlet passages radiating.;` from the. `iamber in the airgioat anda supplemen- ,a-ify fuel nozzle onthe intake side of the 'float andoutside ythe constricted portion around the tloat seth-at it isoperative only under inll throttle conditions.

. lair/,sav

12. ln a carbureter, a constant level supply chamber, an airopening, aconical air float controlling said opening and having a verticallyextending chamber therein', a fuel nozzle extending int-o the chamber,means on the nozzle and cooperating means on the Walls of the guidechamber for giving the Afloat a rotary movement as it rises and fallsand. fuel outlet passages radiating from the ehamber in 'the air float,the outlet passages being spaced from top to bottom of the float and inradiating planes separated by sul stant-ially equalarcs.

i8. ln a carburetor, a constant level supply chamber, an air opening', aconical air float controlling said opening' and having a verticallyextending; chamber therein, a fuel nozzle extending into the chamber;means on the nozzle and cooperating means on the walls of the guidechamber forgiving the float a rotary movement as it rises and falls andfuel outlet passages radiating Jfrom the chamber in the air float, theoutlet passages being spaced vtroni top to bottom of the float inradiating' planes and substantially horizontal.

1l. In a carburetor, a constant level supply chan'ibcr, an air opening,aiconical air float controlling said opening and havingr a verticallyextending' chamber therein, a fuel nozzle extending into the'chamber,means onf` the nozzle and cooperating; means on the walls ot the guidechamber for giving the lloat a rotary movement as it rises and 'fallsand fuel outletpassages radiating from the chamber in the air float, theoutlet passages being spaced from top to bottom olf the `ioat. Y

Signed at Baltimore, day ot' September 1914.

. XVELLNGTN W7 MUliR.

Maryland this 22nd EDWARD L. Basri, linnen .14'. bai-loans

